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OR, if you want to base it on what is actually sustainable in terms of energy usage: The population was fairly stable at < 2 billion people up until ~100 years ago. I don't know that (sans fossil fuels, let's say) this population is sustainable. And in terms of environmental impact, our current population levels have lead to many extinctions and the elimination of many natural habitats. I'd say that we are, for sure, far beyond the normal carrying capacity for our species.
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